Erik Iverson writes:
> Hello,
>
> Can anyone think of a non-iterative way to generate a decreasing
> geometric sequence in R?
>
> For example, for a hypothetical function dg, I would like:
>
>> dg(20)
> [1] 20 10 5 2 1
>
> where I am using integer division by 2 to get each subsequent value in
> t
John Lande writes:
> dear all,
>
> we am trying to improve the performance of my R code, with the implentation
> of some function with custom C code.
> we found difficult to import and export/import data structure such us
> matrices or data.frame into the external C functions.
Please give a *ver
"Lorenzo Cattarino" writes:
> Hi Jim,
>
> Thanks for your reply. Your codes does work but I was hoping to find a
> way to use lapply and avoid the for loop.
>
> Lorenzo
>
>
> -Original Message-
> From: Jim Lemon [mailto:j...@bitwrit.com.au]
> Sent: Monday, 17 May 2010 8:27 PM
> To: Loren
Monte Shaffer writes:
> Hello,
>
> I have programmed in PHP a lot, and wanted to know if anyone figured out
> Variable variables using R.
>
> For example, I have several dataframes of unequal sizes that relate to L
> treatments (1, 2, 3, 4, 5,6, L) ... in this case L=7
You should create a list c
jim holtman writes:
> try:
>
> pattern="*result*\\.csv$"
Just for the record, that's not quite correct. The * doesn't behave like
in a shell glob. Instead, * says "0 or more copies of the previous
character". So the above pattern picks up resul.csv, which I don't think
was intended.
I don't kno
Dimitri Liakhovitski writes:
> Thanks again - and one follow-up question.
> When I do do.call(rbind, lapply(dir(patt = "\\.csv$"), read.csv))
> What is the right way to speicify (probably under "patt") that I only
> need to grab those .csv files that contain a certain string, e.g.,
> "result"?
I
I'm working over an ssh connection without X11 graphics. I'm making a
plot, the first stage of drawing which takes a long time. I want to
experiment with adding details. Here is what I was hoping to do, which
results in error.
## Draw the master plot on png dev 2
png(file="master.png")
plot(1:10)
Flana gmail.com> writes:
>
> Hi,
>
> First, thank you all for your help.
>
> Here is my problem (simplified):
>
> Say I have a list:
> a=list(matrix(50,nrow=5,ncol=5),
> matrix(25,nrow=5,ncol=5),
> matrix(10,nrow=5,ncol=5))
>
> I'd like to use rbinom with a different probability for each m
Aisyah ioz.ac.uk> writes:
>
>
> Hi
>
> Im currently trying to plot my NMDS data together with fitted variables
> (envfit funct) on an ordination plot. The plot function shows two
> displays="sites" and "sp". I was wondering how to plot it so that the sites
> come up as different points for dif
Zoppoli, Gabriele (NIH/NCI) [G] mail.nih.gov> writes:
>
> Please give me just a reference where I can find something useful.
The others are right that rather than randomly googling, you should bite
the bullet and sit down for a couple of hours with some introductory
material on R (a book, or o
anna hotmail.com> writes:
>
> Hello my friends,
> here is a code I wrote with no loops on matrix that is taking too long (2
> seconds and I call him 720 times --> 12 minutes):
>
> mat1 and mat2 are both matrix with 103 columns and 164 rows.
Could you provide some example code creating matrice
gauravbhatti hotmail.com> writes:
>
>
> hI
> I have to calculate V statistic for each row of a large dataframe
> (28000). I can not use multtest package for paired wilcox test. I have
> been using for loop which are. Is there a way to speed the computation
> with another method like using appl
manchester.ac.uk> writes:
>
> On 12-Feb-10 13:14:29, Juan Tomas Sayago wrote:
> > Dear list,
> > I have a list with 1000 x1000 lines and columns
Lists have neither lines nor columns. Can you explain exactly what you have?
E.g. show us the code that created your "list"?
> do you know how I can
Philipp Rappold gmail.com> writes:
>
> Dear all,
>
[...]
> (2) I need this functionality for a customized na.exclude() function
> that I am building, which should only exclude rows that have NA in
> certain columns. Maybe there is already a function which does
> exactly what I need, so I'd h
Dan Davison wrote:
>
>
>
> Jagat.K.Sheth wrote:
>>
>> How about which(colSums(t-v) == 0) ?
>>
>
> But what about v=c(2,1,3)? It needs to be something like
>
> which(colSums((t - v)^2)) == 0
> or
> which(colSums(abs(t - v))) == 0
>
Jagat.K.Sheth wrote:
>
> How about which(colSums(t-v) == 0) ?
>
But what about v=c(2,1,3)? It needs to be something like
which(colSums((t - v)^2)) == 0
or
which(colSums(abs(t - v))) == 0
Dan
Jagat.K.Sheth wrote:
>
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROT
Both shape parameters of rbeta can be vectors; for
x <- rbeta(n, shape1, shape2)
x[i] ~ Beta(shape1[i], shape2[i])
so
bbsim <- function(m=1000, num.post.draws=1e4, size.a=100, prob.a=.27,
prior.count=1) {
data.count <- rbinom(m, size.a, prob.a)
shape1 <- rep(prior.count + data.count, e
What you want is
ConvertMissingToNA <- function (values) {
values[ values == - | values == -99] <- NA
return( values )
}
To see why your version doesn't do what you wanted, maybe it helps to
consider the following?
x <- 1:10
y <- (x[3:6] <- 99)
y ## 99
(It's perhaps not entirely o
Hi Monica,
I think the key to speeding this up is, for every point in 'track', to
compute the distance to all points in 'classif' 'simultaneously',
using vectorized calculations. Here's my function. On my laptop it's
about 160 times faster than the original for the case I looked at
(10,000 observa
Instead of writing some long, ugly, "script", the way to use R is to
break problems down into distinct tasks. Reading data is one task, and
performing regressions on the data, plotting & summarising are
different tasks. Write functions to do each task in general, and then
use those functions.
So o
Hi Rich,
Richard M. Heiberger wrote:
>
> Dan,
>
> The real problem is the use of csv files. csv files don't handle missing
> values
> ("#VALUE" is most likely from Excel), dates, or other complications very
> well.
>
> Read your Excel file directly into
> R with one of the packages designed
helping matters. I don't even
> understand why R is interpreting these figures as factors in the first
> place, doesn't this imply that any similar data would be interpreted as
> factors?
> Thanks for any further help.
> Robin Williams
> Met Office summer intern - He
Hi Robin,
You haven't said where you're getting the data from. But if the answer
is that you're using read.table, read.csv or similar to read the data
into R, then I advise you to go back to that stage and get it right
from the outset. It's very, very common to see people who are
relatively new to
On Thu, Aug 21, 2008 at 03:00:51AM -0700, z3mao wrote:
>
> Hi, this is my first time using R. I want to simulate the following process:
> "in a population of size N, there are i individuals bearing genotype A, the
> number of those bearing A is j in the next generation, which following a
> binomin
Dries Knapen-2 wrote:
>
> Hi,
>
> Thanks for your reply. However, this didn't work exactly as I needed
> it to since the expression is dynamically built as a character vector
>
> i.e. not executed as
> e <- expression(Sepal.Width > 4)
>
> but as
> e <- expression("Sepal.Width > 4")
>
> in
o in those
softwares? R is not trying to be a competitor to them; they do lots of
things R doesn't, and vice versa.
Dan
Shubha Vishwanath Karanth wrote:
>
>
> Thanks, Shubha
>
>
> -Original Message-
> From: Dan Davison [mailto:[EMAIL PROTECTED]
>
On Tue, Aug 12, 2008 at 05:16:01PM +0530, Shubha Vishwanath Karanth wrote:
> Hi R,
>
>
>
> This is a very trivial one
>
>
>
> C=0.1
>
>
>
> I want to check whether my value of C is between 0 and 1 exclusively
> I don't want to use (C>0 & C<1). And I can't use a single statement
On Tue, Aug 12, 2008 at 01:21:29AM -0700, dennis11 wrote:
>
> I want to create a vecor with frequencies.
>
> I have tried this:
>
> a <- c(1,1,1,1,2,3,4,5,5)
> b <- table(a)
> print (b[1])
>
> which results in:
> > print (b[1])
> 1
> 4
>
> The only thing I want is the 4.
>
> So this seems
On Tue, Aug 12, 2008 at 04:47:14AM -0400, Michael R. Head wrote:
> I have a collection of datasets in separate data frames which have 3
> independent test parameters (w, x, y) and one dependent variable (z) ,
> together with some additional static test data on each row. What I want
> is a data fram
On Mon, Aug 11, 2008 at 08:23:19AM +1200, Gareth Campbell wrote:
> Hey team,
>
> If I have a matrix:
>
> 1, 2,
> 3, 4,
> 4, 0,
> 1, 3,
> 0, 3
>
> 2 columns.
>
> I want to write an if command that looks at (in this case) row 3 and looks
> to see if either [3,1] or [3,2] has a zero in it. IF it
On Sun, Aug 10, 2008 at 06:00:21PM +0100, Dan Davison wrote:
> On Sun, Aug 10, 2008 at 09:02:59AM -0700, warthog29 wrote:
> >
> > Hi,
> > I would like to use the R's outer function on y below so that I can subtract
> > elements from each other. The resulting data
On Sun, Aug 10, 2008 at 09:02:59AM -0700, warthog29 wrote:
>
> Hi,
> I would like to use the R's outer function on y below so that I can subtract
> elements from each other. The resulting dataframe is symmetric, save for the
^^
outer() returns a matri
On Sat, Aug 09, 2008 at 08:53:00PM -0400, Kurt Newman wrote:
>
> Resending. Previous message was truncated. Sorry for possible confusion.
>
>
> > From: [EMAIL PROTECTED]
> > To: r-help@r-project.org
> > Date: Sat, 9 Aug 2008 18:25:47 -0400
> > Subject: [
On Sun, Aug 10, 2008 at 02:44:00PM +1200, Gareth Campbell wrote:
> I have a vector:
> alleles.present<-c("D3", "D16", ... )
>
> The alleles present changes given the case I'm dealing with - i.e. either
> all of the alleles I use for my calculations are present, or some of them.
>
> Depending on w
On Sat, Aug 09, 2008 at 06:29:59AM -0500, Marc Schwartz wrote:
> on 08/09/2008 06:01 AM [EMAIL PROTECTED] wrote:
>> Hi;
>> If we have a matrix A, and a vector X, where length(X)=nrow(A), and X
>> contains a wanted column for each row in A, in row ascending order. How
>> would be the most effective
On Fri, Aug 08, 2008 at 07:27:13PM -0700, Alessandro wrote:
> Hi All.
>
>
>
> I have a file txt with 3 columns (X, Y and Z). every rows has 4 decimal
> place (i.e. x.). I use read.table to import the data in R, but with
> summary(), I don't see the decimal place after the dot. Is there any
On Fri, Aug 08, 2008 at 04:44:13PM -0700, Alessandro wrote:
> Hi All,
>
>
>
> I have 2 questions:
>
> 1. Import: when I import my txt file (X,Y and Z) in R with "testground
> <- read.table(file="c:/work_LIDAR_USA/R_kriging/ground26841492694149.txt",
> header=T)", I lost the 4 number afte
Gang Chen-4 wrote:
>
> Hi,
>
> I want to store some number of outputs from running a bunch of
> analyses such as lm() into an array. I know how to do this with a
> one-dimensional array (vector) by creating
>
> myArray <- vector(mode='list', length=10)
>
Note that in R terminology, 'myArray'
Lauri Nikkinen wrote:
>
> R users,
>
> I don't know if I can make myself clear but I'll give it a try. I have
> a data.frame like this
>
> x <- "var1,var2,var3,var4
> a,b,b,a
> b,b,c,b
> c,a,a,a
> a,b,c,c
> b,a,c,a
> c,c,b,b
> a,c,a,b
> b,c,a,c
> c,a,b,c"
> DF <- read.table(textConnection(x),
On Wed, Aug 06, 2008 at 06:32:43PM -0400, Giuseppe Paleologo wrote:
> I was posed the following problem/teaser:
>
> given two matrices, come up with an "elegant" (=fast & short) function that
> returns a matrix with all and only the non-duplicated columns of both
> matrices; the column order does
On Wed, Aug 06, 2008 at 05:42:21PM +, zack holden wrote:
>
> Dear R wizards,
>
> I have a folder containing 1000 files. For each file, I need to extract the
> first row of each file, paste it to a new file, then write out that file.
> Then I need to repeat this operation for each additiona
On Wed, Aug 06, 2008 at 11:53:25AM -0400, Faheem Mitha wrote:
>
> Hi,
>
> Consider the following
>
>> x = c(1,2)
>> y = c(3,4)
>> d = data.frame(cbind(x,y))
>> d$x
> [1] 1 2
>> d$"x"
> [1] 1 2
>>
>> foo = function(val)
> + {
> + return(d$val)
> + }
>>
>> bar = function()
> + {
> + return(d$"x")
On Wed, Aug 06, 2008 at 03:37:48PM +0100, Stephane Bourgeois wrote:
> Hi,
>
>
>
> I do not get how par works, help please.
>
>
>
> Let's say I have a simple plot: plot(1:10)
>
>
>
> I want to change the font size for the x axis... how do I do that?
OK, so firstly go to the help page f
43 matches
Mail list logo
